Inflatable Membrane Bistable Cells for Pressure-Driven Shape Morphing
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Solution Overview
Problem
Conventional shape morphing technologies require large, complex, and costly systems that are difficult to integrate into existing structures like automobiles due to their size and complexity, making them impractical for widespread application.
Innovation Solution
An inflatable structure comprising an array of vertically stacked bistable cells attached to an inflatable membrane, which changes states in response to pressure changes, allowing for lightweight and cost-effective shape morphing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional electromechanical systems or hydraulic/pneumatic systems are used for shape morphing, then shape transformation capability is achieved, but device complexity and size increase significantly
Solution Approach 1:
The structure is divided into multiple discrete bistable cells arranged in arrays, where each cell independently transforms between two stable states. This segmentation allows complex shape morphing to be achieved through simple, repeating units rather than a monolithic complex system.
Solution Approach 2:
The structure employs dynamically transformable bistable cells that can switch between two stable configurations in response to applied loads. This dynamic capability enables shape morphing without requiring complex actuation systems, as the cells inherently possess the ability to transition between states.
2Adaptability or versatility
If conventional electromechanical systems or hydraulic/pneumatic systems are used for shape morphing, then shape transformation capability is achieved, but the number of components increases
Solution Approach 1:
The bistable cells serve multiple functions simultaneously: they provide structural support, enable shape transformation, and act as the transformation mechanism itself. This multi-functionality eliminates the need for separate actuators, linkages, and control components required by conventional systems.
Solution Approach 2:
The invention merges the structural elements with the transformation mechanism by making the load-bearing members themselves the bistable components. This integration eliminates the need for separate actuation systems and reduces the total component count significantly.
3Adaptability or versatility
If conventional electromechanical systems or hydraulic/pneumatic systems are used for shape morphing, then shape transformation capability is achieved, but manufacturing cost increases
Solution Approach 1:
The bistable cells can be manufactured using inexpensive materials and simple fabrication processes such as additive manufacturing or sheet metal forming. The cells are designed to be replaced or reconfigured easily, reducing long-term manufacturing costs despite potential individual cell wear.
Solution Approach 2:
The manufacturing cost is reduced by changing the approach from precision-machined electromechanical components to structures that can be formed through simpler processes. The bistable geometry can be achieved through standard fabrication methods, and material selection can optimize both cost and performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The inflatable structure provides a simple and inexpensive solution for integrating shape morphing capabilities into other systems by using lightweight bistable cells that change states in response to pressure, facilitating easy integration and versatile shape transformation.
Implementation Method 1
Each of the bistable cells of the array is configured to change from a first state to a second state according to a change in pressure within the inflatable membrane
Implementation Method 2
changes states in response to pressure changes
Data Source
AI summary
Apparatuses described herein relate to improving the shape morphing of structures using bistable cells. In one embodiment, an inflatable structure comprises an inflatable membrane with an inner top surface and an inner bottom surface opposite the inner top surface. The inflatable structure further comprises an array of vertically stacked bistable cells with a first end attached to the inner top surface and a second end attached to the inner bottom surface, where each of the bistable cells of the array is configured to change from a first state to a second state according to a change in pressure within the inflatable membrane.